HELIX.— Plate LVII. 



Species 279. (Mus. Cuming.) 



Helix tridextina. Eel. lesld umbilicatd, globoso-de- 

 pressd, nolula, oLUqui striut/i, albidd, fulm-nehuhm, 

 fasciin fuscU Iriius vel quaiuor cingulata; anfractUius 

 quatuor ad quinque, plmndatis, lente accretcenlUius, 

 ultimo subatigulalo, anlice dtjlexu, basi subplano ; aper- 

 turd mbhorUonlali, lunari ; perktomale iiicrauato, 

 reflexo, marffiiiibus jutictk, dexlro rotiuidato, columel- 

 Inri umbiliciim seniitegenie, basali trideiitalo ; dente 

 uno soliiario, duobus junclis, exius scrobiculum latum 

 formantibus. 



The three-toothed Helix. Shell umbilicated, glo- 

 bosely depressed, solid, obliquely striated, wliitish, 

 fulvous-elouded, encircled with three or four brown 

 bands ; whorls four to five, flattened, increasing 

 slowly, the last slightly angled, deflected in front, 

 rather flat at the base; aperture nearly horizontal, 

 lunar; lip thickened, reflected, with the margins 

 joined, right margin rounded, coluraellar margin half- 

 covering the umbUicus, basal margin tlirec-toothed ; 

 one tooth solitary, two approximating, forming out- 

 wardly a broad furrow. 



Ferussac, Hist. Moll. pi. 54 A. f. 4-6. 



Hab. Jamaica. 



In most examples of this species there are two dark 



bands above the periphery of each whorl and one below it. 



Species 2S0. (Mus. Cuming.) 



Helix xigrescens. Eel. testa impetforatd, globulosd, 

 oblique rugosd, saiurali fused ,■ atifractibus quatuor ad 

 quinque, convexiusculis, ultimo venlroso, obsolete an- 

 gustaio, prope aperturam scrohiculato ; aperturd sub- 

 verticali, lunari; peristomale subexpanao, incrasaato, 

 marginibua callo lalo,juxta inserliouem dentem validum, 

 compressum, intranteni, emittente junctis, baaali inaqua- 

 liter bidentato. 



The blackish Helix. Shell imperforated, globular, 

 obliquely wrinkled, very dark brown ; whorls four to 

 five, rather convex, the last veutricose, obsoletely 

 angled, furrowed near the aperture ; aperture sub- 

 vertical, lunar; lip slightly expanded, thickened, 

 margins joined by a callosity, which near its inser- 

 tion emits a strong compressed entering tooth, basal 

 margin iinef|ually two-tooihed. 



\\ ooi). Index Test. su|)p. pi. 7. f. 32. 

 Uelix ful'ujinea, Ferussac. 



Hall, (iuadaluupe. 



This little dark brown species is characterized by a strong 

 iiblong tooth upon the body-whorl, after the manner of the 

 well-known //. puuctala. 



Species 281. (Mus. Cuming.) 



Helix auridexs. Eel. testd anguste umbilicatd, depreaad, 

 supra plauiuaculd, basi coutexd, nigro-fuacd, striata, 

 pilis rigidit, brevibus, erectis, dislanlilus obsitd ; an- 

 fractibus quaiuor ad quinque, contexts, ropidi accres- 

 centibus, ultimo sensim descendente ; aperturd obliqud, 

 subangulosd ; peristomate fuaco-purpureo, reflexo, mar- 

 gine supero areuato, dextro rectiusculo, inlus dente 

 aureo munito, basali subrecto, dente allero viinuto, sape 

 deficienle, prope umbilicum instructo. 



The goldex tooth Helix. Shell narrowly umbilicated, 

 depressed, rather flattened above, convex at the base, 

 blackish-brown, striated, covered with distant short 

 erect rigid hairs ; whorls four to five, convex, rapidly 

 increasing, the last gradually descending; aperture 

 obli([ue, somewhat angular ; Lip brown-purple, re- 

 flected, upj)er margin arched, right margin rather 

 straight, furnished with a gold-like tooth within, 

 basal margin nearly straight, furnished near the um- 

 bilicus with another tooth which is often wanting. 



Eaxg, Guerin's Magiisin de Zoologie, 1834, pi. 49. 



Eab. Martinique. 



A dull dark j)urple-brown shell of light substance, 

 covered with verv short erect distant bristle-like hairs. 



Species 282. (Mus. Cuming.) 



Helix obesa. Eel. testd imperfuratd, depressd, solidd, 

 striata, superne saturate rufd, subtus virente-luted ; 

 anfractibus quinque ad sex, planiusculis, ultimo obaoleti 

 angulato ; aperturd obliqud, transverse lunari, coarc- 

 tatd ; peristomate late incrasaato, marginibus callo 

 crasso, ad insertionem marginis dexlri tuberculum pro- 

 minens formante, junctis, supero breviasimo, basali sub- 

 bidentato. 



The stout Helix. Shell imperforated, depressed, solid, 

 striated, dark red above, greenish-yellow beneath ; 

 whorls five to six, rather flattened, the last obsoletely 

 angled ; aperture obliijue, transversely lunar, con- 

 tracted ; lip broadly tliickened, margin joined by a 

 thick callosity, which at its insertion with the right 

 margin forms a prominent tubercle, upper margin 

 verj' short, basal margin two-toothed. 



Beck, Ind. Moll. p. 35. 



Eelix punctata, Fe'russae (not of Born). 



Eab. Martinique. 



The prominent tubercle on the body-whorl of this species 

 docs not take the form of an entering tooth as in E. punc- 

 tata and nigrescens, but joins on to the upper margin. The 

 siiell is peculiarly flatly deprcsseil at the base. 



